If he can't "expect" him to follow a don't sleep with anyone else rule? Do you mean "have sex with" when you say "don't sleep with"? Because when there is no
expectation of sexual monogamy, then there is no rule there to break.
And if the agreed upon parameter is "you don't stay over at somebody else's house" it would be pretty obvious if the partner did that, no?
As for any other parameters, a person in a non-monagamous relationship has to agree that honest discussions happen and that their primary relationship always comes first.
Doodle, I was in a monogamous relationship and was surprised to find it was perfectly reasonable to me. The point is honesty and openness and not expectation, heartbreak based on rule-breaking, and judgmentalism.
People should only do what they're comfortable with.
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